The core film follows the devastating aftermath of Avengers: Infinity War, where the mad titan Thanos successfully wiped out half of all life in the universe. Five years later, the surviving members of the Avengers—including Iron Man, Captain America, Black Widow, Thor, and Bruce Banner—reunite. Joined by Ant-Man, they venture into the Quantum Realm to travel back in time, pull off a "Time Heist" to gather the Infinity Stones, and attempt to reverse Thanos' actions to bring back billions of lost lives
